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W. P. FREEMAN.

DYNAMO ELECTRIC MACHINE.

N0. 313 488 Patented Mar. 10, 1885.

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UNITED STATES PATENT @rrrcn.

XVARREN P. FREEMAN, OF NEXV YORK, N. Y.

DYNAMG-ELECTRlC MAC SPECIFICATION forming part of Letters Patent 110313488, dated March 10,1885.

Application filed March 10, 1884. (So model.)

To all whom it may concern:

Be it known that I, W ARREN P. FREEMAN, of the city, county, and State of New York, have invented a new and useful Improvement in Dynamo Electric Machines, of which the following is a full and clear description.

This invention relates to an improved construction of the stationary parts of the machine, and the connection and arrangement therewith of the movable parts and mechan ism, thesaid improved construction being such as to permit the easy and perfect assembling of the parts together and the removal of the operative parts from the machine.

The invention will be readily understood by reference to the accompanying drawings, of which Figure l is a central sectional plan of the machine. Fig. 2 is a front end elevation of it. Fig. 8 is a transverse central sectional elevation. Fig. 4 is a detailed elevation of the rotating armature.

Annular plates A and A, placed at the respective ends of the machine and supported on short legs or feet a and a, sustain all of the other parts of the machine. Circular bearingplates B and B are respectively rabbeted or housed into and concentrically secured to the said annular plates A A by means of the assembling-screws b and b, and the center of each of the said plates B and B is bored out to receive and hold in place concentrically with their respective plates A B and A B the hub or bushing pieces 0 and C. By this arrangement the bearing-plates B B, with their bearing or bushing pieces 0 O, and the shaft resting therein, as presently explained, and all of the moving parts of the machine attached thereto, may easily be removed from the machine by simply taking out the assemblingserews b and I), thus facilitating either adjust ment or repair of the machine. The corepieces of the field-magnets D are secured to the inner faces of the annular plates A A, and this arrangement secures the action of the said annular plates, in conjunction with the said I field-magnets,as keeperplates. The field-mag nets are arranged in two sets, each set containing three pairs, the outer ends of each pair respectively attached securely to the aforesaid annular keeper-plates A and A. The inner ends of each of these pairs of magnets abut against intervening segmental pole-pieces E,

to which they are securcl y attached. The inner faces of the pole-pieces E are placed concentric with the central driving-shaft, and each pair of the said iieldanagnets D is placed equally distant from'the common center or axis of the said driving-shalt, and therefore the axial line of each pair of the said magnets readily passes through the segmental piece E and the annular plates A and A. Each set of these magnets contains three pairs, arranged as above described, one of the said sets placed on each side of the machine, as is clearly shown in Figs. 2 and 3, the inner faces of each set arranged in a segmental line coinciding with the inner face of the segmental piece E. Between two adjacent ends of the segmental polepieces E brass plates E are placed, as is shown in Fig. 8, so as to properly brace the said pieces E and hold them in place. The shaft F is carried in the bearing or bushing pieces 0 '0, and receives its motion from the driving-pulley F. The said shaft F carries in its central part the revolving armature G, and at its outer end, opposite the driving-pulley, the commutator H, from which the electricity generated by the machineis delivered in the usual manner. The rotating armature G has a hub, g, which is secured to the shaft F, and concentrically arranged around this hub are a series of armature-rings, g, with an annular separator, f, intervening bet-ween the said armature-rings and the said hub. In the said armature-rings g there are longitudinal peripheral grooves for holding the wire g, with which the armature is wound, and the said grooves are provided with an insulatinglining, g", ofsome suitable material. ]?eripheral. air-passages g are formed in the exterior of the hub g, and between it and the surrounding armature-rings Having described my invention, I claim 1. In a dynamo-machine, two groups or sets of cores of field-magnets placed on opposite sides of a revolving armature, divided by cen tral polar pieces into two sections each, respectively, and combined with annular end keeper-plates, to which the said field-magnet cores are attached, the said annular keeperplates rabbeted to receive and hold end bearing-plates, in which is supported the central shaft of the centrally-located revolving armature.

2. A pair of annular keeper-plates holding ITO between their adjacent faces two sets of fieldmagnet cores placed, respectively, on opposite sides of a central revolving armature, the said annular keeper-plates combined with and rabbeted or housed to receive and hold concentrically with them central disks or supportingplates for thejournal-bearings of the revolving armaturc-shaft.

8. Apair of circular plates or disksholding concentrically with them and perpendicular to their adjacent faces the journal-bearings of a shaft for the revolving armature of a dynamomachine, in combination with the shaft and its rotating armature, and a pair of annular keeper-plates arranged to hold between them the field-magnet cores of the machine, and rabbeted or housed to receive and hold in place the said circular plates or journal-bearing disks, the said disks and their supported axle and rotating armature being removable from to this specification in the presence of sub 5 scribing witnesses.

XVARRES P. FREEMAN. Vitnesses:

M. RANDOLPH, XV. J. DOUGHTY. 

